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At the end of each module u have connect your developer edition through which u have to login to your developer edition and take challenge.
Please let us know if this helps you.
Thanks and Regards
sandhya
In addition to add what Sandhya has explained, you can check the below Trailhead FAQs that could help you further while working on Trailhead.
https://developer.salesforce.com/page/Trailhead_FAQ
Hope this helps you!
Best Regards,
Deepthi